23. mar 2018 09:45 UTC
I have never been a big fan of software using
SYSV IPC shared memory and semaphores. I love PostgreSQL but over the years its use of
SYSV IPC has caused various issues for me. I use Zabbix as well, which makes heavy use of shared memory.
I run all my stuff in FreeBSD jails which used to make things even more complicated, because
SYSV IPC stuff wasn't names...
25. feb 2018 13:34 UTC
SSHFP records has been around for a long time. They were first defined in RFC4255 and conceptually they are very similar to
DANE/TLSA. It is basically a way to pin a hash of the SSH public key in the DNS, to allow clients to verify the public key they see when connecting. This means that I can avoid the unhelpful SSH host fingerprint message that we are all used to seeing when we SSH to a new host.
So instead of seein...
25. feb 2018 13:10 UTC
The nature of Ansible is that it connects to the hosts in its
inventory files over SSH. This opens up some new possibilities since I now have a place which has SSH access to the rest of the infrastructure, which I can use to automate various monitoring scripts.
I've recently added this script to my Ansible roles and wanted to post it here. It is very simple, nothing fancy about it, it just loops over the hostnames found in the Ansible inventory files, SSHs into each ...
05. dec 2017 11:25 UTC
I've been working to replace my
OwnCloud installation with something else. I use the Calendar part of
OwnCloud a lot, and this post is about replacing the
CalDAV bits of
OwnCloud with Radicale, a Python based
supervisord so I will start out by showing the config for those before getting deeper into
02. nov 2017 14:47 UTC
This is the story of a bug I found in
Daphne HTTP and Websocket terminating server, where I had to work around the bug for months while waiting for the fix to make it into a release.
Daphne is part of the
Channels project which is
Djangos cool websocket thing that recently got adopted as a part of the official
Django project. We've been using
Channels for a while on the the Schedule...
19. sep 2017 19:59 UTC
Today I had the pleasure of trying out my new apu2c4. Hit a few snags here and there so I am documenting my experiences for future reference. I have an
apu3 as well, but I haven't played with it yet, so that will have to wait for another blog post.
Qubes installation on my laptop is using the
sys-usb vm thing so the first thing I needed to do was to assign the...
07. jun 2017 05:54 UTC
I am in the process of implementing Certgrinder on all my servers, and as a part of that I am publishing TLSA records for all my services. I haven't been able to do so before, because the normal LetsEncrypt procedure means rolling cert and keys every three months. With Certgrinder I am not rolling the keys when renewing, so I can pin the public keys instead of the certificates in the TLSA records.
Most examples ...
30. apr 2017 12:46 UTC
Like many people I've been switching to LetsEncrypt for my certificate signing needs. I recently changed a bunch of LE related things. This post documents my new method of using the LetsEncrypt
certbot client from a central location, with the certificate consumers (webservers etc) getting their certificates over SSH using a standard CSR. Much like when we were using commercial CAs.
This has a couple of important advantages over my old setup:...
19. nov 2016 13:35 UTC
Earlier this week I was pretty surprised to see some weird permissions on some
nginx config files on my servers. The servers are managed by Ansible so I suspected some changes I made to my ansible roles a few days prior. I only made syntax changes so I didn't expect anything to change. But sometimes the rabbit hole goes deeper than you imagined :)
So I looked at the Ansible task that creates ...
02. oct 2016 12:22 UTC
I spotted a listen queue overflow error message in /var/log/messages on one of my jailhosts today.
I have no idea what could be causing this. This jailhost is busy so it could be a lot of things. Seems to happen about every hour, perhaps some scheduled job?
Most results when you search for the error mention TCP services that can't keep up with the connection rate to the TCP port. But since I didn't know which TCP port I had some detective work to do.
17. mar 2016 10:48 UTC
Djangos database migrations system greatly simplifies the task of keeping multiple databases in sync (the schema, not the data) as the schema evolves over time. Formerly known as South, Djangos migrations system is also a good example of how Django embraces and includes 3rd party packages when it makes sense.
Over the last year I (and colleagues) have been developing a Django-based provisioning system for an ISP. The system has grown rather large with a lot o...
23. jan 2016 20:08 UTC
I was asked to provide a replica of a postgresql server running on FreeBSD. The replica was for reporting purposes, so it must be possible to run read-only queries on it, and it needs to be up-to-date at all times. In postgres land this is called a Hot Standby. Almost the same as a warm standby, except that it accepts connections and read-only queries. The replication had to be done to an Ubuntu 14.04.2 LTS machine running on Amazon. Both postgres servers are version 9...
27. sep 2015 10:56 UTC
This blog used to be based on Django Mezzanine which stopped working for some reason. The whole thing was stupidly complex anyway.
I've written a small Django project to run the blog in the future. The sourcecode can be found on Github.
22. oct 2013 23:24 UTC
This post is about getting OCSP Stapling to work in nginx. OCSP is short for Online Certificate Status Protocol and is a close to realtime method of checking an TLS certificates validity.
This blogpost is based on nginx 1.4.3 (you need at least nginx 1.3.7 for OCSP stapling to work) compiled against OpenSSL 1.0.1e in a FreeBSD 9.2 jail. To compile ...
Showing 14 of 14 blogposts